Hmm...I think this is a really difficult question, with a lot of different sides, and maybe no good one answer. Again, I don't have a lot of info on the topic, so I'm just going to relate my thoughts on what I've heard on the radio and whatnot.
I think its important to note that the loss of importance of family comes from a lot of different sectors.
For example gender dysphoria: A rising mental condition that makes some girls physically feel that they belong more in a guys body. I don't suppose that they would be particularly receptive to oxytocin, or stimulation via maternal instinct if they felt more physically inclined to be a man. So perhaps if we could conclude that a variant expression of oxytocin exists within woman in general, it definitely would not be hard to believe that some women just feel less inclined/binded to maternal instincts like other girls would be.
Theres also scientific advancement. I think were getting to a point where now you can actually choose the eye colour of your child, hair colour, specific immunities against certain disabilities etc... we may eventually come to a point where its more cost effective to just make a baby in a lab, then go through the natural process.
Overall ignorance might be a point too. Since celibacy is gaining traction, some people don't know exactly how powerful the sentiments are after having a kid. How it completely takes over your life.
They might just view the practical/physical aspects of it, and go, "meh, not for me. Costs too much."
Finally there's just the fact that there is too many people on earth! I think men are less incentivized to have babies when they know they might contribute to the overpopulation of earth.
Now does/would all this contribute to the devaluation of a woman?
Well depends on how you would define one. I think gender is a really complicated issue right now in terms of definition, and in my belief I think it might be better to restate the question to how can we sustain the individual, who NEEDS maternal instinct to validate themselves? If one day family is out of the picture, how can we still stay connected?
Do these advancements destroy family fidelity?
Well yeah. Now you have to define yourself by yourself, whether you want to or not.